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Composite models of migration pathways and their controls over hydrocarbon accumulation in the south of Huimin depression
LI Ji yan1, TAN Ming you2, WU Kong you1, SONG Guo qi1,3
(1.School of Geosciences in China University of Petroleum, Qingdao 266555,China;2.Geophysical Research Institute in Shengli Oilfield, Dongying 257000,China;3.Shengli Oilfield Company,SINOPEC, Dongying 257000, China)
Abstract:
The composite models of migration pathways in the south of Huimin depression were established based on the characteristics of single oil and gas migration pathways, and their contributions to hydrocarbon accumulation were evaluated. The results show that the connective sandbody, fault and unconformity are mainly developed in the south of Huimin depression. They can be combined to form three composite models:sand fault sand, sand fault unconformity and sand unconformity. These composite models dominate the migration patterns of hydrocarbons by forming anti Z type and ladder type migrational patterns. In addition, they also control the hydrocarbon spatial distribution. Composite models in Qu di include sand fault unconformity and sand unconformity, which results in the diversity of oil bearing series and reservoir types as well as the character of hydrocarbon 's distant migration. The sole model of sand fault sand in Qianguan tun determines the single of oil bearing series and reservoir types as well as the character of hydrocarbon 's short migration.
Key words:  southern Huimin depression  migration pathways  composite models  hydrocarbon forming process